A number of "disturbing" thefts have allegedly been carried out at mosques across Newham.
According to Newham Muslim Forum, the incidents have affected at least six mosques.
The forum said the most recent incident occurred on May 13 at Anjuman-e-Islamia Newham, High Street North, East Ham, where multiple wallets and mobile phones were allegedly stolen.
A Met Police spokesperson confirmed that they were contacted on May 13 regarding an allegation of theft from a mosque in High Street North, Newham.
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There have been no arrests and enquiries continue.
Other mosques allegedly affected include Quwwatul Islam, Masjid-e-Ilyas, Masjid-e-Tauheed, Masjid Bilal and Masjid al Hira.
Police could not confirm these other allegations of thefts.
The forum is urging mosques in Newham and wider London to review their security arrangements and warn worshippers not to leave valuables or personal belongings unattended.
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Kamran Qureshi, of Anjuman-e-Islamia Newham, said: “We are here to raise awareness about this issue and to urge the local authorities to take swift action in identifying and apprehending the culprit.
“It is highly disturbing to think that places of worship, which are supposed to be sanctuaries of peace and safety, are being targeted by criminals.
“We condemn such acts of criminality and call upon all members of the community to come forward and report any other incidents.”
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Anas Khan, of Newham Muslim Forum, added: “We understand the importance of our local mosques to the local community and the impact that these incidents can have on their sense of safety and security.
“Masjids are safe havens and open to everyone and we will come together as communities to address the issue.
“We will monitor the situation closely and provide updates as necessary.”
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